op chicago



' v 1566552: De?. 22' 1925' o. P. MAxscH TooL HOLDER Filed Jan. 19,*,1924

Patented Dec. 22, 1925.

UNITED STATES 1,566,553 PATENT OFFICE.`

OLIVER. P. MAISCH, OF CHICAGO, ILLINOIS,v A ssIGNOn rro soULLY JONES AND COM- IANY, OF CHICAGO. ILLINOIS. A CORPORATION OF ILLINOIS.

v'rooL HOLDER.

Application led January 19, 1924. Serial No. 687,333.

To all 'whom it may concern.'

Be it known that I. OLIVER P. MAIsoII, a

citizen of the United States, residing at Chi-' cago, in the county of Cook and State of 6 Illinois, have invented a certain new and useful Improvement in Tool Holders, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings forming a part of this specification. l

This invention relates to improvements in tool holders, and more particularly to anl improved tool holder for mounting reamers, taps and similar tools in spindle lathes, turret lathes, and the. like, although the invention is not limited tousc with a particular tool, nor with a particular machine, but may be employed wherever found adaptablc.

Self-alignment of the work and tool is desirable in many classes of machinery. In lathe work, for example, unequal wear in the centers or in the head 'and tail stocks results in ydisalignment of the tool and work as well understood in the art. Slight disalignment may cause very objectionable vresults because of the great accuracy necessary in various classes ofwork. Such disalignment is in diierent directions and oi different types. Wear may result in positioning of the tail stockv above or below, or in different positions to either side of the axis of the head-stock with the axes in parallelism, and angular disalignment may result'in one direction, or in a plurality .of d1.-

irregularity Occurs, or angular disalignment with the axes in parallel planes may occur together.

The primary object of my present invention is vthe provision vof an improved tool holder which will allow the tool to .change its angular position. and which w1ll also permit a fioating or sliding movement of the tool out of alignment with the driving axis and in parallelism with said axis. To permit compensation for parallel disalignment in any direction, I provide a holder which permits parallel disalignmentof the axis of the tool collet with respect to the axis of the drivingshank in a plurality of planes or directions, and to compensate for single angular irregularities in any direction, as well as for any combination of plural angular irregularities, I provide a holder 1n which angular movement of the tools is perrections, as Where a 'double or plural angular mitted in any one or any combination of angular directions by movement about-a point center. y

To facilitate the-self-aligning action of the holder, I provide anti-friction means for Iminimizing friction to the iioating or relative sliding movement, or movement by motion of translation in parallel planes, and the friction to the pivotal action of the holderis also minimized. Means in the form of an adjusting nut binds the parts securely together, and by means of said adjusting nut the pivotal action vof the holder may be controlled or adjusted. End play in the device may also be adjusted by this nut to the desired amount A:for any particular class of work, some work requiringr more end play than other work. The ad justing nutjis also adapted for locking the holder parts'rigidly together Where that is 75 desired.

Another object is therefore, the provision of simple and improved means for binding the parts of the holder together and for adjusting the amount of relative movement between the parts and the amount of. end play, and for locking the parts against relative movement. I

Another object is the provision of a compact device of this sort having a minimum number of parts which may be manufactured and assembled at a minimum cost and.. which may be conveniently taken apart forl` cleaning,- repair and replacement;

The inventionis illustrated in the ac? companying drawings in which:

Fig. 1 is a side elevational view ofa holder embodying the invention;

Y Fig. 2 is an enlarged longitudinal section partially in elevation;

Fig. 3 is a cro-ss section on line 3 3 of Fig. 2;

Fig. 4 is a cross section on line 4-4 of Fig. 2; and i* Fig. 5 is an exploded perspective view of the parts of the holder. Referring to the drawings, the holder has a shank 5 constituting the driving art of the device and adapted to be secure in the turret or tail stock or other tool carryin part of a lathe or other machine with whic the holder is to be used. Shank 5 is shown of the standard taper type with the usual atfaced driving or locking end 6. It may be plain or non-tapered or its style and size l face of lugs 16.

may be otherwise varied 'to suit the particular machine with which it is to be used.

The inner end of shank 5 has an integral enlarged head 7, the inner face or end of which is bored centrally at 8 and slotted diametrically at 9. At the axis of shank 5 the bottom of bore 8 has a conical depress'ion 10 and a ball bearing member 11- seats' or lies freely in said conical depression 10 and in a relative slight centering depression or recess 12 in the outer face or end of a drive member 13. Drive member v13 comprises the disc which has the centering depression 12, and the outer face of said disc has on opposite sides of said depression a pair of radial driving lugs 'or tongues 14 which engage in diametrical slot 9 and drivngly connect shank 5 and member 13 for rotationtogether.

The inner face of member 13 has an axiallv projecting circular boss provided with a diametrical slot or groove 15 dividing it into two driving lugs or jaws 16. Surrounding jaws 16 and secured to the inner face ofI dise 17, as by means of projecting pins 18, is an annular bearing ring 19, the inner face of which preferably projects beyond the inner The tool is carried by a collet 2O which constitutes the driven member of the holder. Collet 20 has an axial socket 21 in which the stem or shank 22 of the tool 23 `is secured by means of a radial set screw24. Tool 23 is for purposes of illustration shown as a rea mer. but it may be a tap or any other tool with which the holder of my invention is found adaptable for use. The inner end of collet 20 has an integral :flange 25 ofslightly less diameter than the outside diameter of head 7, and the outer edge of said flange is tapered ott' or relieved at 26 for a purpose which will hereinafter appear. end of collet 20 has aneaxially projecting circular boss provided witha diametrical slot 28 dividing it into two driving lugs or jaws 29. y

Driving connection is established between driving member 13 and collet 20 bv a counling 30 having projectingfrorrl its inner face a diametrical tongue 31 and fromA its outer face a diametrical tongue 32 disposed at right angles or normal to tongue 31 and engagingvin the diametrical slot 28 between the driving lugs 29 at the inner end of collet 20. Tongue 31 proiects inwardly and engages in the diametrical slot 15 between the .driving lugs 16 on the inner face of drive The inner ing 35 comprises a pair of annular rings l36 having registering tapered or conical open- .ings arranged over a plurality of circumferentially arrangedl anti-friction ball mem bers 37, rings 36 being secured togetherby rivets 38.

Lying in bore 8 and interposed between the inner end of shank 5 and drive member .13 is a coiled spring 40 which maintainsv the parts all in yielding driving engagement and the parts arev all bound together by anl adjusting nut 42 which threads upon the eX- ternal threads on head 7. Nut 42 has at its collet end an inturned flange 45 which coopcrates with collet flange 25' and defines anl axial opening 46 through which the collet projects.v The diameter of opening A46 is larger than the diameter of collet 20, so that there will be a clearance therebetween to permit relative movement between the collet and driving shank. The clearance Vmay vbe greater than shown, as desired, 'f

but ordinarily it need not be great because just a slight clearance will permit considerable angular variation of the cutting end of the tool and slight parallel variation is all that is ordinarily required. The amount of movement may. however, be increased if desired, by increasing the size of opening 46. A ,lock nut 50 in the form of anangular internally threaded ring threads upon' head 7 and cooperates lwith nut 42 to lock same in any desired position of adjustment, the outer.

peripheries of nuts 42 and 50 being preferably knurled to facilitate grasping and threading into place or removing.

The cooperating tongue 32 and groove or slot 28 form a driving connection between coupling 30 and collet 20 which permits relative motion of translation between the collet and the driving member in one direction over anti-friction bearings 37, and the cooperating tongue 31 and groove 15 form a driving connection between the coupling and member 13 which permits relative motion of translation between 4the drive memberand the coupling and thereby between the drive member and the collet in a direction normal or at right angles to the permitted motion of translation between the coupling and collect so that the axes of shank or driving member 5 and collet or driven member 20 maybe off-set with re' spect to each other in anv desired direction. and into anv desired relative position without moving said axes out of parallelism. This permits self adjustment of tool 23 to any disalignment or irregularity in the machine or between the work and tool. As already pointed out, such disalign'ment as this is not usually great. but is di'cult to take up in `the machine itself. Relative movement bef tween the shank and collet in parallel planes permits it to be taken up without moving the axes out of parallelism.

farther onto the ment with nut 42, thereby noted in this connection that the pivotal action about ball member 11 permits double angular movement of the axis of the tool' with respect to the axis of the driving shank, so that the free 'end of the tool may lie/swungv angularly down in one lane and angularly out in another plane, or example, whereby the tool is self-adjusted to double or plural angular irregularities.

Parallel adjustment or relative movement between the shank and collet in one plane, and relative angular movement in another plane is also permitted, so that any single or combination of irregularities will be compensated for. By means of the adjusting nut 42, I am enabled to lock the shank and collet rigidly together by drawing flange of the nut up Asecurely against the outer face of Hange 25, and by unthreading nut 42 from head 7, I am enabled to adjust the amount of angular movement between the shank and collet by adjusting the space between the outer face of flange 25 and lianoe 45. The tapering off of corners of the dan e 25 at 26 removes said corners so as to acilitate angular movement between the parts. The nut 42 also enables me to adjust the end play between the parts. This is -important because some work requires more end play in the holder than other work, just as one material requires more or less end play than another material. As nut 42 is unthreaded from head 7, n ut is threaded head into secure engagelocking nut 42 adjusted position.

While I have described a specific embodiment of the invention, I believe that my provision of a holder which is self-adjusting to any single or any combination of irregularities is broadly new, and a wide range of modification and changes is Acontemplated within the spirit and scope of the appended claims.

1. In a tool holder, a driving shank having a head, said head-having jaw means and securely in any an axial depressiomr: t its inner end, a driving member havjil Yjaw means for driving engagement witliyff che Jaw means on said shank and ani axial centering depression, a ball member 'interposed between the shank and driving member and seated in lsaid delantifriction means pressions, a coupling having dri gagement with and motion of trans atlon relatively to said driving member, a collet having driving engagement with and motion of translation relative said coupling, anti-friction means between the driving member and collet, and an adjusting nut threaded upon the head of the drivin shank and having an ,abutment cooperab e with the collet.

2. In a tool holder, a driving shank having a head, said head having jaw means and an axial depression at its inner end, a having jaw Vmeans engag-l y111g the jaw means on the shank, and an driving member axial centering depression, a ball member interposed between lthe shank and driving member and seated in said depressions, the driving member having angular motion relative the shank about said ball member, a coiled spring interposed between the shank and driving member, a coupling having drivv ing engagement with the driving member and motion of translation relative thereto, a. collet having driving engagement with and motion of translation relative said coupling, between the driving member and collet,"a liange on the collet, an adjusting nut 'threaded upon the head of the driving shank and having an inturned flange cooperable with the ange on the collet, the collet having a shank projecting through said nut and provided with a tool socket, and means for against displacement.

3. In a. tool-holder, a driving shank having a threaded head, a circular o ning pro-A vided in the central portion o said head and an axial centeringdepression concentric with said opening, a rectangular 'slot extending diametrically across saidhead, a. driving member having protruding jaw means relatively rectangular in form for engaging with the slot in said head, a ball mem er seated in said axial centerlng depression and abutting said member and a coil spring seated in said circular opening, a cougling having protruding jaws on opposite sid. thereof an relatively normal to eaeh"ot er, a collet, said driving member a'nd collet havin driving ga mentl with and motion o? translation NI:- tve said coupling, a ball bearing member interposed between the driving member-and collet, and means for adjusting said collet relative said threaded head. i

In witness whereof, I hereunto subscribe my name this 16th day of January, 1924. OLIVER P. MAISCH.

locking said nut 

